Pulley-casing.



UNITED STArESMPArENT OEEIOE.

RUSSELL II. BOWEN, or PALMYRA, NEW JERSEY, ASSIGNOE To THE AMERI- oAN PULLEY COMPANY, or PHILADELPHIA, PENNSYLVANIA, A con- PULLEY-CASING.

Speccaton of Letters Patent.

lFatented.- April 2, 1907'.

Application filed April 12, 1906. Serial No. 311,231.

To all wwnt t may concern:

Be it known that I, RUSSELL H. BOWEN, of the town of Palmyra, in the county of Burlington and State of New Jersey, have invented certain new and useful Improvements in Casing-s for Pulleys, whereof the following is a specification, reference being had to the accompanying drawings.

My invention is peculiarly adapted for use in connection with pulleys of small size, such .as are commonly employed for windowsashes, and I shall therefore describe it with reference to that type.

In the accompanying drawings, Figure I represents a plan view of the pulley-casing and pulley. Fig. II is a side elevation thereof. Fig. III is a longitudinal sectional view on the line III III in Fig. I. Fig. IV is a transverse section on the line IV IV in Fig. I. Fig. V is a plan view of one of the blanks from which the casing is formed. Fig. VI is a similar plan view of the other blank.

The object of my invention is to so organize the structure of a pulley-casing as to per mit the manufacture there of from sheet metal by a series of pressing operations, the number of presses and dies employed being reduced to a minimum and the operations necessary for forming and combining the parts being greatly simplified.

The invention can best be explained byl reference to the several steps which are incident to the manufacture of the casing, as in this way the peculiarities of the ultimate structure will be most readily appreciated.

Tie casing consists, preferably, of two main elements, each of which -is formed from a flat sheet-metal blank, and for convenience of nomenclature I'term these elements, respectively, a shell and a cla1nping-bantl. The blank for the shell is represented in plan view in Fig. V and the blank for the clampingband in FigIII. The only members which are desirable as adjuncts to these are relatively triiiing parts, which will be hereafter referred to.

The shell-blank (shown in Fig. V) comp rises two symmetrical flat wings 1 1 with an intermediate portion 2, having an elongated opening 3 and projecting tongues 4 and 5 at the opposite ends. Said tongues have, respectively, the external configuration there shownw that is to say, the sides of the tongue 4 are straight for a short distance, as indicated at 6 6, and the end thereof is rounded, as shown at 7. The sides 8 8 of the tongue 5 are also straight for ashort distance and then spread laterally to form Straight-edged projections 9 9, into which the rounded end portion 10 merges. The wings l 1 are provided with slits 11 and 12, which are prolongations of the straight sides of the tongues 4 and 5, respectively.

The clamping-band blank (shown in Fig. VI) comprises two straight wings 13 13, arranged at an obtuse angle to one another with an intermediate portion 14, provided with a tongue 15, having straight sides and a rounded end.

A Referring now to the other figures in connection with those just described, the structure is developed as follows: The wings 1 1 of the shell-blank are bent at right angles to the intermediate portion 2 of the sheet on lines a short distance inside of the slits 11 11 and 12 12, respectively, thus assuming the positions indicated at 20 and 21 of Figs. I, II, III, and IV. .The Inetal of the tongues 4 and 5 is pressed so as to upset the edge entirely around the periphery of each, forining upright rims, as indicated at 22 and 23, respectively. The ends of the sides 20 and 21 above the slits 11 and 12 are bent inwardly on curved lines, as indicated at 24e 25, until they abut against one another in a plane which is coincident with the central axis of the shell, being the Jsection-line III III in Fig. I. Shallow depressions are formed in the sides 2O 21 of the shell, extending from the inner extremity of the rim 22 ofthe tongue 4 along an upwardly-inclined line 26 to a region limited by a vertical line below the point 410. (See Fig. III.) The structure thus formed constitutes what I term the shell, which is then clamped by the band whose blank is shown in Fig. VI. The wings 13 13 of said blank are bent toward one another on lines which are approximately the prolongations of 'the straight side of the tongue 15, the intermediate portion 14 being rounded during this operation so as to conform in its inter nal face to the external face of the abutting end portion 24 25 of the shell. The extreme ends of the wings 13 13 are upset at right angles to the plane of said wings, as indicated at 27.Y M

The dimensions of the tongue 15 are such that it will 'fit snugly within the recess formed by the raised rim 22 on the tongue 4., and the inclination and dimensions of the wings are such that they will fit snugly into the shallow depressions formed in the sides 2() 21 of the shell, the external surfaces of the wings 13 13 being substantially flush with the undepressed surfaces of the shell and the upset portions 27 projecting laterally at the vertical lines where the depressions terminate. The clamping-band is forcibly applied in the location just described, and the parts are then in the positions indicated in Figs. I to IV.

The tongue l5 of the clamping-band having been seated within the recessed rim 22 of the tongue 4, a hole is punched through both tongues, and the edges of the metal at the holes are countersunk inwardly until they meet, as shown at 28. K (See Fig. III.) A rivet 29 is then applied which secures the clamping-band in position at that end. The tongue 5 is provided with a block 31, having an aperture 32 to afford a proper threaded bearing for the screw by means of which the Casing is to be secured in its ultimate position. This block has vertical sides tapering slightly toward the inner end, as indicated at 33, and shallow projecting flanges 3% 34' on each side along its lower portion.

The lower end of vthe aperture 32 is deeply countersunlr, as shown at 35, and the block is Jfitted snugly in the recess formed by the rim 23 upon the tongue 5. Thereupon the two projections 9 9 of the blank are folded down and pressed home against the tapering sides 33 of the block and upon the flanges 34 34 thereof. A hole is formed in the tongue 5, registering with the aperture 32, and the metal of the tongue is forced into the countersunk end of the aperture of the bloclr, as indicated at 36 in F ig. III, so that the block is securely locked in position. A hole is formed at 37, extending through both wings of the clamping-band and both side walls of the shell. rl"he pulley 38, having a central hole, is inserted in position between the side walls 2O and 21 of the shell, and the spindle or pin 39, upon which the pulley turns freely, is passed Athrough the holes in the clamping-band and side walls and pulley and is upset or riveted at each end, so that the entire structure is thus firmly held together.

The casing is applied in the usual manner to the sash or other member for which it is intended, the vertical Hanges 27 forming abutments which are convenient in many cases and the proper means for fastening being afforded by the threaded block 32.

Having thus described my invention in its preferred form and indicated a typical series of operations for its manufacture, I wish it to `be understood that I do not limit my claims in any way by reference to the several steps mentioned, since it is obvious that both in the order of their procedure and in the nature of the operations themselves a wide range of variation will be practicable. Horeover, in some instances it may be found possible to dispense with the clamping-band and to secure the side walls together solely by the riveted spindle or pin which affords the bearing for the pulley mounted between them. Hence I desire to include in my claims the structure whether the clamping-b and be present or absent.

I claim- 1. In a pulley-casing, the combination with a pressed metal shell having bent side walls and inwardly-bent edges; and a projecting tongue formed integrally with said walls, of a clamping-band embracing the side walls and. secured to said tongue.

2. In a pulley-casing, the combination with a pressed metal shell having bent side walls and inwardly-bent edges, and a projecting tongue formed integrally with said walls g of a clamping-band embracing the side walls and secured to said tongue; and a second tongue also formed integrally with said walls and provided with a bearing-block adapted to receive a screw or other fastening device.

3. In a pulleycasing, the combination with a pressed metal shell having bent side walls with inwardly-bent edges; and projecting tongues formed integrally with said walls and having raised rims, of a clamping-band embracing said side walls and provided with a tongue seated within the rim of one of said tongues upon the shell, a bearing-block seat- Ved within the rim of the other of said tongues upon the shell and means for securing said members together. j

4. In a pulley-casing, the combination, with a pressed metal shell having bent side walls with inwardly-bent edges and projecting tongues formed integrally with said walls; of overhanging projections arranged upon one of said tongues; a bearing-block seated upon said tongue and beneath said projections; and means for securing said side walls together and for affording a bearing for a pulley mounted between them.

In testimony whereof I have hereunto signed my name, at Philadelphia, Pennsylvania, this 10th day of April, 1906.

RUSSELL H. BOIEN. Vitnesses 1 JAMES H. BELL, E. L. FULLERTON.

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